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Investments in Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2012
Investment in Marketable Securities [Abstract]  
Investments in marketable securities
The following table summarizes the Company’s available-for-sale securities on hand as of March 31, 2012 and December 31, 2011 (in thousands):
 
 
Investments in marketable securities
 
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Marketable securities at March 31, 2012
$
24,819

 
$
(4,551
)
 
$
—

 
$
20,268

 
 
 
 
 
 
 
 
Marketable securities at December 31, 2011
$
24,819

 
$
(4,975
)
 
$
—

 
$
19,844